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SUBTRACTION Self-Correcting Quiz - NINES

1
11
-  9
2
17
-  9
3
13
-  9
4
12
-  9
5
15
-  9
6
13
-  9
7
18
-  9
8
12
-  9
9
10
-  9
10
16
-  9
11
16
-  9
12
10
-  9
13
14
-  9
14
14
-  9
15
11
-  9
16
17
-  9
17
18
-  9
18
15
-  9
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